/* ==========================================================================
   STAV Comp — Tepelné čerpadlá NORDIS · landing page
   Design system: "Modernist" tokens + page styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. TOKENS
   -------------------------------------------------------------------------- */
:root {
  --color-bg: #f3f2f2;
  --color-surface: #eae9e9;
  --color-text: #201e1d;
  --color-divider: color-mix(in srgb, #201e1d 40%, transparent);

  /* brand red */
  --color-accent: #e2001a;
  --color-accent-100: #ffe9ec;
  --color-accent-200: #ffd0d6;
  --color-accent-600: #c40017;
  --color-accent-700: #a30013;
  --color-accent-800: #7a0010;
  --color-accent-900: #4d0a10;

  --color-neutral-100: #f8f4f4;
  --color-neutral-200: #eae7e7;
  --color-neutral-300: #d7d3d3;
  --color-neutral-400: #bab6b6;
  --color-neutral-500: #9b9797;
  --color-neutral-600: #7d7979;
  --color-neutral-700: #605d5d;
  --color-neutral-800: #444141;
  --color-neutral-900: #2d2b2b;

  --font-heading: "Archivo", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Archivo", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-heading-weight: 800;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 28px;
  --space-8: 32px;

  --radius-md: 0px;

  --shadow-sm: 0 1px 2px color-mix(in srgb, #2d2b2b 14%, transparent);
  --shadow-md: 0 3px 10px color-mix(in srgb, #2d2b2b 16%, transparent);
  --shadow-lg: 0 12px 32px color-mix(in srgb, #2d2b2b 22%, transparent);

  --wrap: 1180px;
  --header-h: 74px;
}

/* --------------------------------------------------------------------------
   2. BASE
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  font-weight: 400;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0 0 var(--space-2);
}
h1 { font-size: 42px; }
h2 { font-size: clamp(25px, 4vw, 32px); }
h3 { font-size: 25px; }
h4 { font-size: 20px; }

p { margin: 0 0 var(--space-3); }
a { color: var(--color-accent); text-underline-offset: 3px; }
img { display: block; max-width: 100%; }
svg { display: block; }

:focus { outline: none; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
::selection { background: color-mix(in srgb, var(--color-accent) 30%, transparent); }

.text-muted { color: color-mix(in srgb, var(--color-text) 55%, transparent); }
.grayscale { filter: grayscale(1) contrast(1.08); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

.hr { height: 2px; border: 0; margin: var(--space-4) 0; background: var(--color-divider); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: var(--space-4); }
.section { padding-block: clamp(40px, 6vw, 64px); }

/* --------------------------------------------------------------------------
   3. BUTTONS / TAGS / CARDS
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  cursor: pointer; text-decoration: none;
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 14px; line-height: 1.2; color: var(--color-text);
  background: transparent; border: 1px solid transparent;
  padding: var(--space-2) calc(var(--space-3) * 1.2);
  border-radius: var(--radius-md);
  transition: background .16s ease, color .16s ease, transform .16s ease;
}
.btn:disabled, .btn[aria-disabled="true"] { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-600); }
.btn-primary:active { background: var(--color-accent-700); }
.btn-secondary { border-color: var(--color-divider); }
.btn-secondary:hover { background: color-mix(in srgb, var(--color-text) 7%, transparent); }
.btn-ghost { color: var(--color-accent); padding-inline: var(--space-1); background: none; }
.btn-ghost:hover { background: color-mix(in srgb, var(--color-accent) 10%, transparent); }
.btn-invert { background: var(--color-bg); color: var(--color-accent); }
.btn-invert:hover { background: #fff; }
.btn-lg { min-height: 54px; font-size: 17px; padding-inline: var(--space-6); }
.btn-md { min-height: 48px; font-size: 16px; padding-inline: var(--space-6); }
.btn-block { width: 100%; min-height: 46px; font-size: 16px; }

.tag {
  display: inline-flex; align-items: center; font-size: 11px;
  letter-spacing: .02em; padding: 3px 10px;
}
.tag-accent { background: var(--color-accent-100); color: var(--color-accent-800); }
.tag-outline { border: 1px solid var(--color-accent); color: var(--color-accent); }

.card {
  display: flex; flex-direction: column; gap: var(--space-2);
  padding: var(--space-3); background: var(--color-surface);
}
.card-body { margin: 0; font-size: 13px; flex: 1; }
.card-meta {
  display: flex; align-items: center; gap: 6px; font-size: 11px;
  color: color-mix(in srgb, var(--color-text) 50%, transparent);
}
.elev-sm { box-shadow: var(--shadow-sm); }
.elev-lg { box-shadow: var(--shadow-lg); }

/* --------------------------------------------------------------------------
   4. FORM CONTROLS
   -------------------------------------------------------------------------- */
.field > label {
  display: block; font-size: 12px; margin-bottom: 5px;
  color: color-mix(in srgb, var(--color-text) 70%, transparent);
}
.input {
  width: 100%; min-height: 44px; padding: 8px 10px; font: inherit;
  font-size: 15px; color: var(--color-text); caret-color: var(--color-accent);
  background: var(--color-surface);
  border: 1px solid var(--color-divider); border-radius: var(--radius-md);
  appearance: none;
}
select.input {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='none' stroke='%23201e1d' stroke-width='2' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center;
  padding-right: 34px;
}
.input:hover { border-color: color-mix(in srgb, var(--color-text) 45%, transparent); }
.input:focus-visible { border-color: var(--color-accent); outline-offset: 0; }
.input.is-invalid { border-color: var(--color-accent); background: var(--color-accent-100); }

.seg {
  display: inline-flex; overflow: hidden; width: 100%;
  border: 1px solid var(--color-divider);
}
.seg-opt {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  flex: 1; padding: 11px 12px; font-size: 14px; cursor: pointer; user-select: none;
}
.seg-opt input { position: absolute; opacity: 0; width: 0; height: 0; pointer-events: none; }
.seg-opt + .seg-opt { border-left: 1px solid var(--color-divider); }
.seg-opt:has(input:checked) { background: var(--color-accent); color: #fff; }
.seg-opt:not(:has(input:checked)):hover { background: color-mix(in srgb, var(--color-text) 7%, transparent); }
.seg-opt:has(input:focus-visible) { outline: 2px solid var(--color-accent); outline-offset: -2px; }

.check {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 12px; cursor: pointer;
}
.check input {
  width: 18px; height: 18px; margin: 1px 0 0; flex: none;
  accent-color: var(--color-accent);
}
.check.is-invalid span { color: var(--color-accent-700); }

/* --------------------------------------------------------------------------
   5. HEADER
   -------------------------------------------------------------------------- */
.topbar { height: 3px; background: var(--color-accent); }

.site-header {
  position: sticky; top: 0; z-index: 30;
  background: #fff; border-bottom: 2px solid var(--color-divider);
}
.header-inner {
  max-width: var(--wrap); margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex; align-items: center; gap: var(--space-4);
}
.header-logo { display: flex; align-items: center; text-decoration: none; margin-right: auto; }
.header-logo img { height: 46px; width: auto; }
.header-actions { display: flex; align-items: center; gap: var(--space-3); }

/* --------------------------------------------------------------------------
   6. HERO
   -------------------------------------------------------------------------- */
.hero {
  position: relative; background: #000;
  border-bottom: 3px solid var(--color-accent);
}
.hero-bg {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; opacity: .55;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(0,0,0,.82) 0%, rgba(0,0,0,.55) 55%, rgba(0,0,0,.3) 100%);
}
.hero-inner {
  position: relative; max-width: var(--wrap); margin: 0 auto;
  padding: clamp(48px, 9vw, 110px) var(--space-4);
  min-height: min(74vh, 620px);
  display: flex; flex-direction: column; justify-content: center;
}
.hero-title {
  color: #fff; font-size: clamp(32px, 5.6vw, 64px); line-height: 1.03;
  margin-bottom: var(--space-4); max-width: 20ch;
  text-shadow: 0 2px 24px rgba(0,0,0,.4);
}
.hero-sub {
  color: rgba(255,255,255,.88); font-size: clamp(16px, 2vw, 21px);
  max-width: 52ch; margin-bottom: var(--space-7);
}
.hero-note {
  color: rgba(255,255,255,.75); font-size: 13px; margin-top: var(--space-3);
  display: flex; align-items: center; gap: 6px;
}
.hero-note svg { flex: none; }

/* --------------------------------------------------------------------------
   7. PROBLEM CARDS
   -------------------------------------------------------------------------- */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
}
.problem-card { gap: var(--space-2); }
.problem-card h3 {
  font-size: 19px; margin: 0;
  font-family: var(--font-heading); font-weight: 800;
}
.problem-card p { font-size: 14px; margin: 0; }

/* --------------------------------------------------------------------------
   8. HOW IT WORKS
   -------------------------------------------------------------------------- */
.how { border-block: 2px solid var(--color-divider); background: #fff; }
.how-grid {
  max-width: var(--wrap); margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.how-text {
  padding: clamp(32px, 5vw, 56px) var(--space-4);
  border-right: 2px solid var(--color-divider);
}
.how-text p { font-size: 16px; max-width: 48ch; margin: 0; }
.how-stat {
  padding: clamp(32px, 5vw, 56px) var(--space-4);
  display: flex; flex-direction: column; justify-content: center;
  align-items: center; text-align: center;
  background: var(--color-accent); color: #fff;
}
.how-stat b {
  font-family: var(--font-heading); font-weight: 800;
  font-size: clamp(48px, 8vw, 72px); line-height: .95; letter-spacing: -.03em;
}
.how-stat p { margin: var(--space-3) 0 0; font-size: 16px; max-width: 34ch; opacity: .95; }

/* --------------------------------------------------------------------------
   9. PROCESS
   -------------------------------------------------------------------------- */
.process-rail {
  display: flex; align-items: stretch; flex-wrap: wrap;
  margin-bottom: var(--space-6);
}
.step-btn {
  flex: 1 1 160px; min-width: 150px;
  display: flex; flex-direction: column; align-items: flex-start; gap: 10px;
  padding: var(--space-4);
  border: 2px solid var(--color-divider); background: #fff; color: var(--color-text);
  font-family: var(--font-body); cursor: pointer; text-align: left;
  transition: background .18s, border-color .18s, color .18s;
}
.step-btn + .step-btn, .step-arrow + .step-btn { margin-left: -2px; }
.step-btn:hover:not(.is-active) { border-color: var(--color-accent); }
.step-btn.is-active {
  border-color: var(--color-accent); background: var(--color-accent); color: #fff;
  position: relative; z-index: 1;
}
.step-num {
  display: grid; place-items: center; width: 40px; height: 40px;
  font-family: var(--font-heading); font-weight: 800; font-size: 19px;
  background: var(--color-accent-100); color: var(--color-accent);
  transition: background .18s;
}
.step-btn.is-active .step-num { background: #fff; }
.step-title { font-family: var(--font-heading); font-weight: 800; font-size: 15px; line-height: 1.15; }
.step-arrow {
  flex: 0 0 auto; display: flex; align-items: center; justify-content: center;
  padding: 0 6px; color: var(--color-accent);
}
.process-detail {
  border: 2px solid var(--color-divider); background: #fff;
  padding: var(--space-6); display: flex; gap: var(--space-4); align-items: flex-start;
}
.process-detail .bar { flex: none; width: 8px; align-self: stretch; background: var(--color-accent); }
.process-kicker { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.process-title { font-family: var(--font-heading); font-weight: 800; font-size: 22px; margin-top: 4px; }
.process-desc { font-size: 15px; margin: var(--space-2) 0 0; max-width: 58ch; }

/* --------------------------------------------------------------------------
   10. WHY US
   -------------------------------------------------------------------------- */
.why {
  position: relative; background: #000; color: var(--color-bg);
  border-block: 3px solid var(--color-accent);
}
.why-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .4; }
.why-overlay { position: absolute; inset: 0; background: rgba(0,0,0,.55); }
.why-inner {
  position: relative; max-width: var(--wrap); margin: 0 auto;
  padding: clamp(40px, 5vw, 64px) var(--space-4);
}
.why-list {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4) var(--space-8); margin-bottom: var(--space-6);
}
.why-item { display: flex; gap: 12px; align-items: flex-start; font-size: 15px; }
.why-item svg { flex: none; color: var(--color-accent); margin-top: 2px; }

.stats {
  display: flex; gap: var(--space-8); flex-wrap: wrap;
  justify-content: center; text-align: center;
  padding-top: var(--space-5); border-top: 2px solid rgba(255,255,255,.25);
}
.stat-num {
  font-family: var(--font-heading); font-weight: 800;
  font-size: clamp(40px, 7vw, 64px); line-height: 1;
  color: var(--color-accent); letter-spacing: -.03em;
}
.stat-num span { font-size: .4em; }
.stat-label {
  font-size: 11px; letter-spacing: .06em; text-transform: uppercase;
  margin-top: 6px; opacity: .85;
}

/* --------------------------------------------------------------------------
   11. REVIEWS
   -------------------------------------------------------------------------- */
.reviews-shell { position: relative; }
.reviews-track {
  display: flex; gap: var(--space-4);
  overflow-x: auto; scroll-behavior: auto;
  padding: 4px 44px;
  scrollbar-width: none; -ms-overflow-style: none;
}
.reviews-track::-webkit-scrollbar { display: none; }
.review-card {
  flex: 0 0 300px; padding: 0; overflow: hidden; background: var(--color-surface);
  transition: transform .2s, box-shadow .2s;
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.rev-photo { height: 190px; background: var(--color-neutral-300); }
.rev-photo img { width: 100%; height: 100%; object-fit: cover; }
.rev-body { padding: var(--space-3); display: flex; flex-direction: column; gap: var(--space-2); }
.rev-stars { color: var(--color-accent); letter-spacing: 2px; }
.rev-text { margin: 0; font-size: 14px; }
.rev-nav {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 3;
  width: 48px; height: 48px; display: grid; place-items: center;
  background: var(--color-accent); color: #fff; border: none; cursor: pointer;
  box-shadow: var(--shadow-md);
}
.rev-nav:hover { background: var(--color-accent-600); }
.rev-nav.prev { left: -8px; }
.rev-nav.next { right: -8px; }

/* --------------------------------------------------------------------------
   12. FAQ
   -------------------------------------------------------------------------- */
.faq { border-top: 2px solid var(--color-divider); background: #fff; }
.faq-inner { max-width: 820px; margin: 0 auto; padding: clamp(40px, 6vw, 64px) var(--space-4); }
.faq-list { border-top: 2px solid var(--color-divider); }
.faq-item { border-bottom: 2px solid var(--color-divider); }
.faq-q {
  width: 100%; display: flex; align-items: center; gap: var(--space-3);
  background: none; border: none; padding: var(--space-4) 0; cursor: pointer;
  text-align: left; font-family: var(--font-heading); font-weight: 800;
  font-size: 17px; color: var(--color-text);
}
.faq-q:hover { color: var(--color-accent); }
.faq-sign { color: var(--color-accent); flex: none; width: 24px; font-size: 22px; line-height: 1; }
.faq-a {
  margin: 0; overflow: hidden;
  padding: 0 0 0 calc(24px + var(--space-3));
  max-height: 0; opacity: 0;
  transition: max-height .28s ease, opacity .2s ease, padding-bottom .28s ease;
}
.faq-item.is-open .faq-a { max-height: 400px; opacity: 1; padding-bottom: var(--space-4); }
.faq-a p { font-size: 15px; max-width: 60ch; margin: 0; }

/* --------------------------------------------------------------------------
   13. CALCULATOR / FORM
   -------------------------------------------------------------------------- */
.form-section {
  scroll-margin-top: calc(var(--header-h) + 12px);
  padding-inline: var(--space-4);
}
.form-grid {
  max-width: 1080px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: clamp(24px, 4vw, 44px); align-items: start;
}
.form-intro h2 { font-size: clamp(26px, 4vw, 40px); margin-bottom: var(--space-4); }
.form-intro > p { font-size: 16px; max-width: 46ch; margin-bottom: var(--space-6); }
.benefits { display: flex; flex-direction: column; gap: var(--space-3); }
.benefit { display: flex; gap: 10px; align-items: center; font-size: 14px; }
.benefit svg { flex: none; color: var(--color-accent); }

.calc-card {
  background: var(--color-surface); padding: var(--space-6);
  display: flex; flex-direction: column; gap: var(--space-6);
}
.calc-progress { display: flex; align-items: center; gap: var(--space-3); }
.calc-track { height: 6px; flex: 1; background: var(--color-neutral-300); }
.calc-bar { height: 100%; width: 50%; background: var(--color-accent); transition: width .3s; }
.calc-steplabel { font-size: 12px; white-space: nowrap; }
.calc-step { display: flex; flex-direction: column; gap: var(--space-4); }
.calc-step[hidden] { display: none; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }

.result-head {
  background: var(--color-accent); color: #fff; padding: var(--space-6);
  margin: calc(var(--space-6) * -1) calc(var(--space-6) * -1) 0;
}
.result-kicker { font-size: 12px; letter-spacing: .1em; text-transform: uppercase; opacity: .85; }
.result-price {
  font-family: var(--font-heading); font-weight: 800;
  font-size: clamp(30px, 6.4vw, 44px); line-height: 1.05; margin-top: var(--space-2);
}
.result-after { font-size: 14px; margin-top: var(--space-2); opacity: .92; }
.result-meta { font-size: 12px; margin-top: var(--space-3); opacity: .8; }
.result-proof {
  font-size: 11px; margin-top: var(--space-3); padding-top: var(--space-2);
  border-top: 1px solid rgba(255,255,255,.3); opacity: .85;
  display: flex; align-items: center; gap: 6px;
}

.model-box {
  display: flex; gap: var(--space-3); align-items: center;
  border: 2px solid var(--color-divider); padding: var(--space-3); background: #fff;
}
.model-photo {
  width: 100px; height: 100px; flex: none; background: var(--color-surface);
  display: grid; place-items: center;
}
.model-photo img { width: 100%; height: 100%; object-fit: contain; }
.model-kicker { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.model-name { font-family: var(--font-heading); font-weight: 800; font-size: 19px; line-height: 1.15; margin-top: 3px; }
.model-fit { font-size: 12px; margin-top: 4px; }

.perks {
  border: 2px solid var(--color-divider); border-top: none;
  padding: var(--space-3); margin-top: calc(var(--space-4) * -1);
  background: #fff; display: flex; flex-direction: column; gap: var(--space-3);
}
.perk { display: flex; gap: 12px; align-items: center; font-size: 14px; }
.perk i {
  flex: none; width: 32px; height: 32px; display: grid; place-items: center;
  color: var(--color-accent);
}

.disclaimer {
  background: var(--color-accent-100); border: 2px solid var(--color-accent);
  padding: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2);
}
.disclaimer h4 {
  display: flex; align-items: center; gap: 8px; margin: 0;
  font-size: 16px; color: var(--color-accent-800);
}
.disclaimer h4 svg { flex: none; }
.disclaimer p { margin: 0; font-size: 13px; color: var(--color-accent-900); }
.disclaimer .tags { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: 2px; }

.lead-form { display: flex; flex-direction: column; gap: var(--space-3); }
.lead-form h4 { margin: 0; }
.form-error { font-size: 13px; color: var(--color-accent-700); font-weight: 600; }
.hp-field { position: absolute; left: -5000px; width: 1px; height: 1px; overflow: hidden; }

.thanks { display: flex; flex-direction: column; gap: var(--space-3); padding: var(--space-4) 0; }
.thanks-mark {
  width: 52px; height: 52px; background: var(--color-accent); color: #fff;
  display: grid; place-items: center;
}
.thanks h4 { margin: 0; }

.spinner {
  width: 16px; height: 16px; flex: none;
  border: 2px solid rgba(255,255,255,.4); border-top-color: #fff;
  border-radius: 50%; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --------------------------------------------------------------------------
   14. CLOSING BANNER + FOOTER
   -------------------------------------------------------------------------- */
.banner { background: var(--color-accent); color: #fff; }
.banner-inner {
  max-width: var(--wrap); margin: 0 auto;
  padding: clamp(32px, 5vw, 48px) var(--space-4);
  display: flex; flex-wrap: wrap; gap: var(--space-6);
  align-items: center; justify-content: space-between;
}
.banner h2 { color: #fff; margin: 0 0 var(--space-2); }
.banner p { margin: 0; opacity: .92; max-width: 42ch; }

.site-footer { max-width: var(--wrap); margin: 0 auto; padding: var(--space-6) var(--space-4); }
.footer-inner {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--space-3);
  align-items: center;
}
.footer-brand { font-family: var(--font-heading); font-weight: 800; font-size: 15px; }
.footer-legal { font-size: 12px; }
.footer-legal a { color: inherit; }

/* sticky mobile CTA */
.mobile-cta {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
  display: none; gap: 2px;
  background: var(--color-accent); box-shadow: 0 -2px 14px rgba(0,0,0,.25);
}
.mobile-cta a {
  flex: 1; display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 10px; text-decoration: none; color: #fff;
  font-family: var(--font-heading); font-weight: 800; font-size: 15px;
}
.mobile-cta a.alt { flex: 0 0 auto; padding-inline: 18px; background: rgba(0,0,0,.22); }

/* --------------------------------------------------------------------------
   15. RESPONSIVE
   -------------------------------------------------------------------------- */
/* Below ~1000px the 4 steps + arrows no longer fit on one line, so the rail
   becomes an explicit 2×2 grid. Arrows are display:none, therefore the
   buttons are addressed with :nth-of-type (they are the only <button>s). */
@media (max-width: 999px) {
  .process-rail { display: grid; grid-template-columns: 1fr 1fr; }
  .step-arrow { display: none; }
  .step-btn, .step-btn + .step-btn, .step-arrow + .step-btn { margin: 0; }
  .step-btn:nth-of-type(2n) { margin-left: -2px; }
  .step-btn:nth-of-type(n+3) { margin-top: -2px; }
}

@media (max-width: 900px) {
  .header-actions .btn-primary { display: none; }
  .header-actions .btn-secondary { min-height: 44px; }   /* comfortable tap target */
  .how-text { border-right: none; border-bottom: 2px solid var(--color-divider); }
  .rev-nav.prev { left: -4px; }
  .rev-nav.next { right: -4px; }
}

@media (max-width: 760px) {
  h1 { font-size: 34px; }
  .header-logo img { height: 38px; }
  .hero-inner { min-height: auto; padding-block: 56px 48px; }
  .hero-overlay {
    background: linear-gradient(180deg, rgba(0,0,0,.72) 0%, rgba(0,0,0,.62) 60%, rgba(0,0,0,.72) 100%);
  }
  .hero-title { max-width: none; }
  .process-detail { padding: var(--space-4); }
  .calc-card { padding: var(--space-4); }
  .result-head { margin: calc(var(--space-4) * -1) calc(var(--space-4) * -1) 0; padding: var(--space-4); }
  .stats { gap: var(--space-6); }
  .stat { flex: 1 1 40%; }
  .banner-inner { flex-direction: column; align-items: stretch; }
  .banner-inner > div { width: 100%; }
  .banner .btn { width: 100%; }
  .mobile-cta { display: flex; }
  body { padding-bottom: 56px; }
  .reviews-track { padding-inline: 0; }
  .rev-nav { display: none; }
  .review-card { flex: 0 0 min(300px, 82vw); }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 460px) {
  .field-row { grid-template-columns: 1fr; }
  .model-box { flex-direction: column; align-items: flex-start; }
  .header-actions .btn-secondary { font-size: 13px; padding-inline: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

@media print {
  .site-header, .mobile-cta, .rev-nav { display: none !important; }
}